General advice: Ticket prices are often very high when the schedule extension is first released. Then they drop a bit. The "sweet spot" seems to be about 6 weeks out. After that point, they start rising again, as it gets closer to the travel date. This of course varies widely, depending on you location/destination, and date of travel. Prime travel periods (Spring break, around the holidays, etc.) tend to not drop as much from their initial price. Southwest's fares fluctuate often, so it's best to check often and re-fare if it's dropped since you booked.
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